Again he limiteth a certain day (πάλιν τινὰ ὁρίζει ἡμέραν)
For limiteth rend. defineth. For the verb see on declared, Rom 1:4. The meaning is, he gives another opportunity of securing the rest, and calls the period in which the opportunity is offered today.
In David
The date of the composition of Psa 95:1-11 is uncertain. In lxx (94) it is called a Psalm of David. In the words in David the writer may adopt the lxx title, or may mean simply in the Psalms. In the Hebrew the Psalm has no inscription.
After so long a time (μετὰ τοσοῦτον χρόνον)
The time between Joshua and David. After this long interval he renews the promise in the Psalm.
As it is said (καθῶς προείρηται)
Rend. as it hath been before said; referring to the citations, Heb 3:7, Heb 3:8, Heb 3:15.